move UserToken and UserTokenService to models package

pkg/models/user_token.go

@@ -0,0 +1,32 @@
+package models
+
+import "errors"
+
+// Typed errors
+var (
+	ErrUserTokenNotFound = errors.New("user token not found")
+)
+
+// UserToken represents a user token
+type UserToken struct {
+	Id            int64
+	UserId        int64
+	AuthToken     string
+	PrevAuthToken string
+	UserAgent     string
+	ClientIp      string
+	AuthTokenSeen bool
+	SeenAt        int64
+	RotatedAt     int64
+	CreatedAt     int64
+	UpdatedAt     int64
+	UnhashedToken string
+}
+
+// UserTokenService are used for generating and validating user tokens
+type UserTokenService interface {
+	CreateToken(userId int64, clientIP, userAgent string) (*UserToken, error)
+	LookupToken(unhashedToken string) (*UserToken, error)
+	TryRotateToken(token *UserToken, clientIP, userAgent string) (bool, error)
+	RevokeToken(token *UserToken) error
+}